Partnership

If you live alone, consider how much you can save by living with someone else, and splitting the cost. A significant other is ideal. A roommate is the next best thing.

One house payment. One property tax bill. One electric / gas bill. One water bill. One garbage bill. One phone / Internet / cable bill. One set of furnature. Maybe only one car payment / gas tank to fill / car to insure. More than one person needs to eat, but only 1 refrigerator needs to keep the food cold. Only 1 oven needs to be in use to cook dinner. More laundry, but not necessarily twice as many loads to be washed and dried.

Twice the income to pay for it all. More job security. It's less likely that two people will lose their jobs simultaneously, than one person at a time.

Overall, this presents a safety-net along with an increased ability to save / invest money that's left over. Money you might not be able to save, alone. After ten or twenty years, the savings can be substantial.